The US military is no stranger to green technology, and in 2010 the Pentagon invested an estimated $1.8 billion on renewable tech. And, unsurprisingly, that number is expected to grow dramatically over the coming decades.

According to market research firm Industrial Info Resources, by 2030 the Pentagon will be spending $26.8 billion on renewable energy. That staggering increase will include everything from solar and wind to biomass and geothermal energy.

Previously, the US Marines implemented use of solar panels in Afghanistan, and found that energy consumption was reduced by 90 percent.

As a comparison, it was recently revealed that last year China was the biggest investor in green energy, spending just shy of $50 billion.